Feds grant key permit for Enbridge tunnel, but state roadblock remains

The U.S. Army Corps of Engineers approved a permit for Enbridge Energy's Line 5 pipeline tunnel project in Michigan, despite tribal nations' objections. The project aims to replace a segment of the pipeline crossing the Straits of Mackinac. The Army Corps stated the project complies with regulations and does not impair tribal treaty rights, but tribes argue the review was flawed and ignored their concerns. Enbridge needs additional state permits to proceed with construction, which faces ongoing

Enbridge's $4B Sunrise project, expanding Westcoast Energy's natural gas pipeline, is split into four segments. Construction began in July, with completion expected by 2028. The project aims to add 300M cubic feet per day capacity, involving multiple contractors and Indigenous partnerships. Enbridge has spent $54M on Indigenous businesses as of March 2026.

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The U.S. Army Corps of Engineers approved a permit for Enbridge Energy's Line 5 pipeline project in Michigan, despite tribal nations' objections and potential environmental impacts. The project aims to replace a 4-mile segment of the pipeline. Enbridge must still secure state permits and faces ongoing legal challenges.

The U.S. Army Corps of Engineers, Detroit District, said it issued Enbridge Energy’s individual permit for the Line 5 Tunnel project, which would place a new pipeline segment under about four miles of Lake Michigan at the Straits of Mackinac and retire the existing twin pipeline. The Corps said the decision follows multiple federal environmental and historic review laws; Michigan Supreme Court and EGLE permits remain part of the process.

The U.S. Army Corps of Engineers approved a permit for Enbridge’s plan to replace the Line 5 oil pipeline crossing under Michigan’s Straits of Mackinac with a tunnel, after a Michigan Supreme Court order required additional environmental review of another permit. Enbridge says the $500 million tunnel project complies with federal rules and would keep Line 5 operating.